I wonder if the there is a direction of rotation for the tyres and when we flip it, if it will affect the grip and handling of the bike? Or are the tyres for Flat track specially made where they can be used in any direction for rotation.
The Dunlop/Goodyear tires used to be directional, but we ignored it. There was a bit of tread separation once in a blue moon, but otherwise there was no noticeable difference. The latest generation Dunlop is marked for either direction.
Whats the purpose in running weighted wheels in flattrack.is it to add bite to one end of the bike or the other or are they using a weighted wheel to add rotating weight to detune their motor package or both?
Great question! TL;DR: the added inertia dampens spin. Specifically, sudden change in the amount of spin. If you have ever seen wheelspeed data graphed over time, "normal" acceleration is somewhat smooth. Then there will be a sharp peak when power is too much for available traction. Those peaks need to be smoothed out. The weighted wheel does this quite well in FT. My engineer buddies hate this solution due to unsprung mass increase, but in practical application, its' benefits outweigh the downsides. Engineers want to add flywheel weight, but due to the physics of the distance from center of the flywheel vs the rear wheel, there is no way for a flywheel to have the same damping level as a weighted wheel.
I wonder why they dont run split sprockets and split brake discs.it save a ton of time.lol. My kart runs em and i run a #35 chain and have had a 250cc 2-stroke motor on it
Thanks for the comment! I dug into this with an engineer buddy who works in the racing industry on brakes specifically. He also races flat track, and mentioned he raced KT100 karts w/split sprockets. Long story short-ish the power pulses of flat track bikes (particularly the open class singles and twins) would require a massive split sprocket to make up for its' loss of strength/integrity. And he agreed, that we can change a knockoff as fast or faster than split sprockets. It would be fun to make a video of a sprocket change race!
I always wondered about racing knock off wheels....and now I know. Great couple of videos. Cheers.
Chick's do dig them
YES!
Thanks for the post! Good stuff! Ice riding starts soon in Wisc!!
Fingers crossed!
Great job, thanks mike!
You bet!
Usefull explanations! We like this kind of wheels as well, best option for flat track.
Yes indeed!
I loove my qc wheel! 👌🏻👌🏻
You’re running 37 up to 47, but what are you running in the front mike?
Always a 15t countershaft sprocket on the Rotax.
I wonder if the there is a direction of rotation for the tyres and when we flip it, if it will affect the grip and handling of the bike? Or are the tyres for Flat track specially made where they can be used in any direction for rotation.
The Dunlop/Goodyear tires used to be directional, but we ignored it. There was a bit of tread separation once in a blue moon, but otherwise there was no noticeable difference. The latest generation Dunlop is marked for either direction.
Thank you. I always wondered
What else you wondering about? I'm always looking for video ideas. Thanks!
Whats the purpose in running weighted wheels in flattrack.is it to add bite to one end of the bike or the other or are they using a weighted wheel to add rotating weight to detune their motor package or both?
Great question! TL;DR: the added inertia dampens spin. Specifically, sudden change in the amount of spin. If you have ever seen wheelspeed data graphed over time, "normal" acceleration is somewhat smooth. Then there will be a sharp peak when power is too much for available traction. Those peaks need to be smoothed out. The weighted wheel does this quite well in FT. My engineer buddies hate this solution due to unsprung mass increase, but in practical application, its' benefits outweigh the downsides. Engineers want to add flywheel weight, but due to the physics of the distance from center of the flywheel vs the rear wheel, there is no way for a flywheel to have the same damping level as a weighted wheel.
I wonder why they dont run split sprockets and split brake discs.it save a ton of time.lol. My kart runs em and i run a #35 chain and have had a 250cc 2-stroke motor on it
Thanks for the comment! I dug into this with an engineer buddy who works in the racing industry on brakes specifically. He also races flat track, and mentioned he raced KT100 karts w/split sprockets. Long story short-ish the power pulses of flat track bikes (particularly the open class singles and twins) would require a massive split sprocket to make up for its' loss of strength/integrity. And he agreed, that we can change a knockoff as fast or faster than split sprockets. It would be fun to make a video of a sprocket change race!